Carla: Unable to run Python Example codes in CARLA 0.9.1

[YashBansod]

I downloaded the Pre-Compiled version of CARLA 0.9.1. Extracted it in a directory.
Then I started CARLA in server mode: ./CarlaUE4.sh.
As per the change log of the release - https://github.com/carla-simulator/carla/blob/master/CHANGELOG.md#carla-091
The example.py is now tutorial.py

So, in a new terminal I type: python tutorial.py.
I get the following error:

Traceback (most recent call last):
File "tutorial.py", line 21, in
import carla
File "PythonAPI/carla-0.9.1-py2.7-linux-x86_64.egg/carla/__init__.py", line 7, in
File "PythonAPI/carla-0.9.1-py2.7-linux-x86_64.egg/carla/libcarla.py", line 7, in
File "PythonAPI/carla-0.9.1-py2.7-linux-x86_64.egg/carla/libcarla.py", line 6, in __bootstrap__
ImportError: libpng16.so.16: cannot open shared object file: No such file or directory

I tried running: python manual_control.py.
I get the following error:

Traceback (most recent call last):
File "manual_control.py", line 63, in
from PythonAPI import carla
ImportError: No module named PythonAPI

I am sure I followed all the instructions in the Getting Started page of documentation to word.
https://carla.readthedocs.io/en/latest/getting_started/

Can someone help me with what I am doing wrong?

[Marwa215]

I think you should to use python3 instead of python2 as Carla9.1 support python3 right now.

[danil-tolkachev]

Try this
```
sudo apt-get install libpng16-16
````

[fcagroupj]

try this: https://github.com/fcagroupj/fcarsim

[YashBansod]

@danil-tolkachev Thanks a lot. Your solution solved my problem for running the tutorial.py.
@nsubiron I think this dependency should be added in the documentation.

However I am still getting the error when running the manual_control.py.

Traceback (most recent call last):
File "manual_control.py", line 63, in
from PythonAPI import carla
ImportError: No module named PythonAPI

[YashBansod]

@Marwa215 I had tried running the scripts on 2.7, 3.5 and 3.6 before posting the issue. However, I was unable to run it.

When I do: python manual_control.py, I get:

Traceback (most recent call last):
File "manual_control.py", line 63, in
from PythonAPI import carla
ImportError: No module named PythonAPI

but, When I do: python3 manual_control.py, I get:

Traceback (most recent call last):
File "manual_control.py", line 63, in
from PythonAPI import carla
ImportError: cannot import name 'carla'

So with python3, its recognizing PythonAPI but unable to import carla from it.

[YashBansod]

To run the example code - manual_control.py, you also need to go inside PythonAPI directory and extract carla-0.9.1-py3.5-linux-x86_64.egg there.
Then you need to copy the contents of the extracted folder back into PythonAPI directory.
The PythonAPI directory should look like this:

• PythonAPI
  
  
  
  • carla
  
  
  • EGG-INFO
  
  

And then I was able to run it by python3 manual_control.py.

[YashBansod]

The python manual_control.py Still gives the error though:
Things I tried:

• extracting the carla-0.9.1-py2.7-linux-x86_64.egg
• Adding the following to Python Path: export PYTHONPATH=./:PythonAPI/

But the error remains the same

[danil-tolkachev]

@YashBansod Are you sure that you are using right version of manual_control.py? I've checked PythonAPI/manual_control.py (not Deprecated/PythonClient/manual_control.py) and there's no line from PythonAPI import carla.

[YashBansod]

@danil-tolkachev I downloaded the Pre-Compiled version of CARLA 0.9.1. The manual_control.py in the precompiled version has that line. Its because in the Precompiled version, the manual_control.py is outside the PythonAPI directory.

[YashBansod]

Finally I found the solution.
I had to create a __init__.py file in the PythonAPI directory to make it work with python2.7. This is required since python2.7 requires the __init__.py file to recognise a directory as a python package.

Note: you do not need to export any Python Path.

[danil-tolkachev]

@YashBansod It's strange. In the precompiled version (0.9.1 from https://github.com/carla-simulator/carla/releases) I don't see such lines. Also, in the PythonAPI i have *.egg files, so it doesn't require __init_.py.

[autonomobil]

I had a similar issue in a conda enviroment. This was my solution:

• locate .egg-files in Carla/PythonAPI/carla/dist/
• change/install python version in conda enviroment which fits closest to an .egg-file (for me carla-0.9.6-py3.5-linux-x86_64.egg -> 3.5)
• delete all other .egg-files (just for tidiness)
• extract your .egg-file, e.g. carla-0.9.6-py3.5-linux-x86_64
• create setup.py inside the folder (carla-0.9.6-py3.5-linux-x86_64) with the following content:

from distutils.core import setup
setup(name='carla',
      version='0.9.6', #doesn't matter I guess
      py_modules=['carla'],
      )

• then you can install the carla-python-package via pip:
  pip install -e ~/Carla/PythonAPI/carla/dist/carla-0.9.6-py3.5-linux-x86_64

That solved it for me. I don't even need the egg-path-appending-stuff, which is happening at the beginning of every python-script, just import carla.